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If someone provided a fixed .class file I'd be very thankful, it would also likely work with 1.8.8+ just by renaming it to the correct obfuscated class for each update.

Quote from Bjossi»

If someone provided a fixed .class file I'd be very thankful, it would also likely work with 1.8.8+ just by renaming it to the correct obfuscated class for each update.

You can't just rename an obfuscated class; you also have to rename every single reference to obfuscated variables, methods, and other classes inside that class; good luck in finding out what each one refers to without fully deobfuscating the jar, that's why we have tools like MCP (not updated since 1.8) so we can work with consistent names.

For example, here are the first 10 lines of the method "func_180781_a" (which is a case of MCP not properly deobfuscating code itself; this method is called "initializeAllBiomeGenerators" in 1.6.4-1.7.10, so even there you have to do some renaming when updating mods to 1.8):

GenLayerIsland var4 = new GenLayerIsland(1L);
GenLayerFuzzyZoom var13 = new GenLayerFuzzyZoom(2000L, var4);
GenLayerAddIsland var14 = new GenLayerAddIsland(1L, var13);
GenLayerZoom var15 = new GenLayerZoom(2001L, var14);
var14 = new GenLayerAddIsland(2L, var15);
var14 = new GenLayerAddIsland(50L, var14);
var14 = new GenLayerAddIsland(70L, var14);
GenLayerRemoveTooMuchOcean var16 = new GenLayerRemoveTooMuchOcean(2L, var14);
GenLayerAddSnow var17 = new GenLayerAddSnow(2L, var16);
var14 = new GenLayerAddIsland(3L, var17);